Determination of the decarburation depth

Presentation for participants

Reference of the ILC


References of test methods

ISO 3887  ASTM E1077



This ILC can be organised this year thanks to our preregistration procedure, which ensures an enough number of participants.

Main characteristics

d₁ (total decarburization), d₂ (functional decarburization), d₃ (partial decarburization), d₄ (global decarburization)

Other characteristics

Surface carbon content, heart carbon content, surface hardness, heart hardness


Caution The number of determinations may be low for the secundary characteristics, what may make inefficient the comparison between laboratories


Determination of the assigned values (“true values” for each characteristic)

By statistical computation of the totality of the results with possible selection on competence criteria (accreditation, validation by a reference body, quantity of tests performed in the year), test to detect possible collusion, merging of results not obtained in reproductibility conditions, suppression of technically unvalid results.

Type of statistical computation

For numerical results, the statistical computation will provide an assigned value with its attached uncertainty, values of standard deviations for repeatability and reproductibility, limits of alerts for bias and repeatability of the participant, indiviual values for uncertainty of results of participants.

Number of products submitted to tests


Number of samples per participation


Max number of operators per participation

10 (For this CIL, the type of test and sample size allow to provide results determined by several different operators and by several different methods)

Product submitted to tests

Low alloyed steel

Type of samples


Approximate dimensions of samples

Ø40x50 mm

Specific preparation to be performed by the participant

Preparation of surfaces of observation


Special notice for this ILC

Determinations of d₁, d₂, d₃, d₄ can be performed with the 3 methods : metallographic, chemical and/or hardness


Time schedule:


Opening date of registrations


Registration deadline


Date of shipment of samples


Start of the tests


Deadline for carrying out the tests and providing the results


Date of delivery of reports


Note: After the deadline, registrations are only accepted within the limit of availability of samples


Price (€)


Price if online payment (€)


Approximate weight (kg)